DE102017211337B4 - Brake booster device with a multipart fastening device for the brake booster - Google Patents

Abstract

A brake booster device comprising a brake booster (10) mounted to a vehicle component (30) via a fastener (50), the fastener (50) having at least two fasteners (51; 52), a first fastener (51) fixed to the brake booster (10) is connected, while a second fastening part (52) is fixedly connected to the vehicle component (30), and wherein the two fastening parts (51, 52) via at least one connecting element (60, 60 ') are interconnected the two fastening parts (51; 52) each having a recess (53; 54) which are aligned with each other, wherein the push rod (80) of a brake pedal through the recesses (53; 54), characterized by an actuator (20) through which the brake booster (10) along the vehicle component (30) is displaceable, wherein the actuator (20) in a frontal impact by a force s transmission housing (40) is activated, and wherein the actuator (20) is pivotally mounted below the brake booster (10) and when pivoting a force in the Z direction upwards on the brake booster (10), so that the brake booster (10 ) is moved along the vehicle component (30), wherein the connecting element (60; 60 ') is deformed by shear stress loading during movement of the brake booster (10) along the vehicle component (30), and wherein the two attachment members (51; 52) are slidably slid in a direction along the vehicle component (30) in a guide.

Description

The invention relates to a brake booster device according to the preamble of claim 1, comprising a brake booster which is attached via a fastening device to a vehicle component.

A generic brake booster device is in the JP 10-264 785 A disclosed.

The KR 10 2001 066 542 A discloses a brake booster device whose fastening device allows only an axial displacement oriented on a bulkhead. In this case, fasteners are provided, one of which is connected to the brake booster and the other with the bulkhead. The two fasteners are bolted together. In at least one of the fastening elements, a slot is arranged in the longitudinal direction, so that the screw can slide along the slot, so that impact energy is reduced.

The DE 10 2008 015 294 A1 discloses a motor vehicle and a method for releasing indentation space in a vehicle through the use of active components, the motor vehicle having an indentation space for energy absorption in a collision, a passenger compartment, a shock displaceable component spaced from the passenger compartment by the indention space inflatable component disposed between the passenger compartment and the push-displaceable component and having an intermediate component disposed between the passenger compartment and the push-displaceable component and adjacent to the inflatable component, the inflatable component being in operative engagement with the intermediate component, so in that the intermediate component is moved when the inflatable component is inflated, wherein indentation space between the shock-displaceable component and the passenger compartment is at least partially released from blocking.

Motor vehicles are equipped with brake boosters to increase the pedal force. In this case, vacuum brake booster can be used. However, motor vehicles can also be provided with electric brake boosters, which is particularly advantageous in electric vehicles and hybrid vehicles. In electric brake boosters, the pulse of the brake pedal is used to induce the AC voltage of a coil to release kinetic energy through the combination of the coil and the core, which aids the braking force of the pedal. The DE 20 2010 017 605 describes, for example, such an electric brake booster.

Transmissions for hybrid vehicles usually have relatively large dimensions because they include components and functions that are not required in transmissions for vehicles used exclusively with internal combustion engines. For example, it is necessary to be able to switch between the different types of drive (e.g., electric and internal combustion engine). In addition, one or more electric motors may be located in the transmission housing.

If a large vehicle with associated housing and an electric brake booster are used in a hybrid vehicle, a direct force connection between the gear housing and the brake booster system may arise due to the installation situation between the gear housing and the system of the electric brake booster during a frontal collision in the X direction. However, with regard to the safety of occupants of the vehicle, this is problematic, because in the event of a frontal impact, this can lead to deformation of the bulkhead, to a shift of the brake pedal and to deformations of the dashboard carrier. The steering column can also move. This massively degrades the integrity of the passenger compartment and is not acceptable in terms of occupant safety.

In view of the prior art presented, the improvement of occupant safety in various combinations of transmissions and brake booster therefore still has room for improvement.

The invention has for its object to provide a brake booster device with which the occupant safety can be improved in the event of a frontal impact. In particular, the brake booster should improve occupant safety when using an electric brake booster in combination with a large gearbox.

According to the invention the object is achieved by a brake booster device having the features of claim 1. Further, particularly advantageous embodiments of the invention disclose the respective dependent subclaims.

The brake booster device has a brake booster which is attached to a vehicle component via a fastening device. In particular, the brake booster is an electric or electromechanical brake booster. However, such a fastening device can also be used for conventional vacuum brake booster to replace it from the bulkhead in. The vehicle component is especially around the bulkhead of a vehicle. Fasteners for brake booster can be formed for example by a mounting plate and a plurality of screw. However, the fastening device according to the invention has at least two fastening parts, wherein a first fastening part is fixedly connected to the brake booster, while a second fastening part is fixedly connected to the vehicle component. The two fasteners can be formed by plates and / or profiles. The fixed connections of the fastening parts with the brake booster or the vehicle component can be formed for example by screw. The at least two fastening parts are then connected to one another via at least one connecting element, which is deformed during a movement of the brake booster along the vehicle component by shear stress load.

Such movement of the brake booster along, for example, a dash panel occurs when the brake booster is displaced in a frontal impact by other components of the vehicle, which apply a force to the brake booster. In this case, the two fastening parts of the fastening device move in parallel planes to each other, whereby the deformed at least one connecting element. Such deformation may include, in addition to bending, also a breakage of the connecting element. In any case, the connection between the two fastening parts is released, so that the brake booster can move along the vehicle component.

Preferably, the two fastening parts of the fastening device are connected to one another via a plurality of connecting elements. A connecting element may for example be formed by a bolt, which is guided by mutually aligned bores in the first fastening part and the second fastening part. Such a bolt may also be referred to as a shear pin, which yields due to its material and / or its dimensions at a certain shear stress load. But other forms of fasteners, such as brackets, can be used.

The displacement of the brake booster takes place in particular upwards in the Z direction. However, the movement can also have a share in the X direction, so that the brake booster is pushed obliquely upwards, as is the case with a conventionally inclined bulkhead. In this case, the terms "top" and "bottom" refer to the installation state of a brake booster device in a vehicle. The X-direction represents in the vehicle coordinate system, the longitudinal direction of the motor vehicle, while the Z-direction represents the vertical. The Y direction corresponds to the transverse direction of the vehicle. The movement of the brake booster in the Z direction is effected by the action of force of another component of the vehicle in the X direction when the component hits the brake booster from below.

In the case of the component which, in the event of a frontal impact from below, applies a force in the X direction to the underside of the brake booster, is, for example, a transmission housing. The gearbox slides from below under the brake booster and pushes it upwards. According to the invention, the brake booster arrangement has an actuator, by means of which the brake booster can be displaced along the vehicle component, wherein the actuator can be activated in the event of a frontal impact by the action of force of a transmission housing.

The transmission housing exerts a force in the X direction on the actuator, which thereby exerts a force in the Z direction on the brake booster.

The actuator is appropriate for this purpose and trained. According to the invention, the actuator is pivotally mounted below the brake booster and brings when pivoting a force in the Z direction up to the brake booster on. Moves in the case of a frontal impact, the housing of a transmission of the motor vehicle in the X direction to the brake booster, the transmission housing previously meets the actuator, which is thereby pivoted upward and thereby exerts a force in the Z direction on the brake booster. The actuator is thus pivoted from a normal position in which he applies no force to the brake booster in an activated position in which he pushes the brake booster in the Z direction. In this case, the actuator may already have contact with the brake booster in the normal position, or the required contact is produced only by the pivoting. The brake booster is displaced in the Z direction by the force of the actuator. The brake booster is thus pushed up in its entirety along a vehicle component such as the bulkhead.

Such an actuator can be designed in various ways. For example, it may be an angled arm pivotally attached to a vehicle component at one end. The actuator can also be formed by a plurality of elements which change their position relative to each other during pivoting of the actuator. The actuator is in both cases in the direction of Gearbox from the vehicle component. The actuator can be formed by rods, tubes, profiles, plates or other rigid components. The elements are so stiff and stable that they withstand the forces that occur and do not deform. Preferably, the elements for this purpose are high-strength, for example made of steel, sheet metal, aluminum, forged components, etc. formed. The articulated connection of the actuator with another vehicle component, such as the bulkhead, can be implemented in various ways. For example, the connection may be a one-degree-of-freedom joint, such as hinges. An articulated connection can thus be formed for example by a bolt which is guided by two bushes.

However, the connection of the actuator to a vehicle component may also be made over a portion of material having a stiffness that is less than the stiffness of the remaining material of the actuator. For example, the actuator may be formed in this area by a plate or a profile made of metal, which or which is bent. In this bent region, the rigidity of the metal is lower than in the rest of the range. In normal operation, the actuator keeps its shape and the position of the actuator does not change. However, as soon as a force exerted by a transmission housing in the X direction, enter the connection areas with less rigidity and the actuator pivots upward.

If such a pivot axis between the actuator and a vehicle component formed by a material portion with lower rigidity, this is preferably a reinforcing element is provided which is fixedly fixed to the vehicle component. The reinforcing element and the actuator are then formed by a common component, which however is bent in the region of the axis of rotation to be generated. In this bent portion, the rigidity of the material of the component is lower than in the material portions constituting the actuator and the reinforcing member. If a force in the X direction is exerted on the actuator by means of a transmission housing, the material section deforms with the low rigidity. As a result, a pivot axis is generated about which the actuator can be pivoted. The reinforcing element on the vehicle component can also be formed by a rod, a tube, a profile, a plate or other components. The attachment of the reinforcing element to the vehicle component is located very close to the pivot axis to be generated in order to effect a defined buckling in this area.

However, the description of such an actuator is to be understood only as an example and an actuator may be formed in other advantageous ways. In any case, such a displacement of the brake booster takes place in the Z direction along a vehicle component such as the bulkhead. In this case, the two fastening parts of the fastening device move against each other. A first attachment part on the brake booster moves with this, while the second attachment part remains fixed to the vehicle component.

Thus, the two fasteners can move controlled against each other, a guide is provided according to the invention. This guide may be formed with various types of guide elements, which include grooves, rails, skids, etc. According to the invention it is provided that the two fastening parts are slid in the direction along the vehicle component in a guide sliding into one another. For example, for this purpose, a fastening part has at least two sliding grooves running in the Z direction, in which corresponding sliding elements of the respective other fastening part are accommodated. These two sliding grooves can run parallel to each other, but their distance from each other can also vary. In particular, it can be provided that increases the distance between the Gleitnuten in the Z direction. The two Gleitnuten run upwards conically apart or they are V-shaped to each other. Also in the X direction, the Gleitnuten may be formed V-shaped. Moves the brake booster with its attachment part in the Z direction upwards, so a simple and safe displacement of the brake booster is facilitated.

Furthermore, the two fastening parts each have a recess, wherein these two recesses are aligned with each other and the push rod of a brake pedal is guided through the recesses. In this way, the two halves of the fastening device can move unhindered each other without being hindered by a coupling rod. The recesses are chosen so large in the Z direction, ie along the vehicle component, that the push rod of the brake pedal is guided even after a displacement of the brake booster freely through the recesses. For this purpose, the recesses are formed in particular by elongated holes, the longitudinal alignment in the Z-direction, that extends along the vehicle component.

In normal operation, the fastening part of the brake booster is held by the connecting elements on the fastening part of the vehicle component. In order to keep the weight of the brake booster, a support element may further be provided, which supports the brake booster. In one embodiment of the invention, for example, the second attachment part Supporting element which projects in the direction of the brake booster of this second fastening part. The second attachment part on the vehicle component is then L-shaped, and the first attachment part rests with the weight of the brake booster on the supporting element thus formed. This improves the noise performance and the durability of the brake booster device.

A brake booster thus forms together with the multipart fastening device on a vehicle component of a brake booster device according to the invention, which can be advantageously used in a motor vehicle. In a frontal impact, the brake booster shifts controlled along the vehicle component in the Z direction. The load path in the X direction from the gear housing to the brake booster is thus advantageously interrupted. Due to the deformation of the connecting elements between the two fastening elements, the displacement is controlled, without causing the tilting of the brake booster. The bulkhead of the vehicle is less deformed and fastening screws on the brake booster and the vehicle component are not destroyed. In addition, brake pedal and steering column are not or only slightly moved towards the passenger compartment. This increases the safety of the occupants in a frontal impact.

Further, it is possible to restore the fastening device after a frontal impact by the two fasteners are connected to each other with new fasteners.

In particular, the invention is suitable for use in large transmissions with large gearboxes, as are typically used in hybrid vehicles. In particular, this is a hybrid vehicle with a transmission, which is designed to switch between electric drive and another type of drive. Furthermore, it is particularly suitable for use in electric brake boosters, which are also used in hybrid vehicles. The invention can be used particularly advantageously here because of the size and arrangement of these vehicle components, but it can also be used advantageously in other combinations of gears and modules mounted on the splash screen (brake boosters, ESP modules, etc.).

For the purposes of the invention, a frontal impact includes any impact, ie an accident in which a correspondingly acting force component is generated.

• 1 eine schematische Seitenansicht eines Getriebegehäuses und eines Bremskraftverstärkers mit Aktuator,
• 2 einen schematischen Schnitt in der Z-X-Ebene durch eine Ausführungsform einer Befestigungseinrichtung für einen Bremskraftverstärker im Normalbetrieb,
• 3 einen schematischen Schnitt A-A durch eine Befestigungseinrichtung gemäß 2,
• 4 einen schematischen Schnitt B-B durch eine Befestigungseinrichtung gemäß 2,
• 5 einen schematischen Schnitt in der Z-X-Ebene durch eine Befestigungseinrichtung gemäß 2 nach einer Verschiebung des Bremskraftverstärkers,
• 6 eine Frontansicht einer ersten Ausführungsform eines feststehenden Befestigungsteils,
• 7 eine Frontansicht einer zweiten Ausführungsform eines feststehenden Befestigungsteils,
• 8 eine Frontansicht einer zweiten Ausführungsform eines beweglichen Befestigungsteils, und
• 9 einen schematischen Schnitt C-C durch eine Befestigungseinrichtung gemäß 8.

Further advantageous embodiments of the invention are disclosed in the subclaims and the following description of the figures. Show it

• 1 a schematic side view of a transmission case and a brake booster with actuator,
• 2 a schematic section in the Z - X Plane through an embodiment of a fastening device for a brake booster in normal operation,
• 3 a schematic section A - A by a fastening device according to 2 .
• 4 a schematic section B - B by a fastening device according to 2 .
• 5 a schematic section in the Z - X Level by a fastening device according to 2 after a shift of the brake booster,
• 6 a front view of a first embodiment of a fixed fastening part,
• 7 a front view of a second embodiment of a fixed fastening part,
• 8th a front view of a second embodiment of a movable fastening part, and
• 9 a schematic section C - C by a fastening device according to 8th ,

In the different figures, the same parts are always provided with the same reference numerals, which is why these are usually described only once.

The schematic side view of 1 shows an embodiment of a brake booster, which is part of a brake booster device according to the invention. In particular, the brake booster is an electric brake booster. The view of 1 in this case provides a view in the Y direction of the motor vehicle on the brake booster 10 dar. The brake booster 10 is at the bulkhead 30 a motor vehicle mounted and is in known manner in connection with a brake pedal and a brake system of the motor vehicle (not shown). The brake booster 10 is about a multi-part fastening device 50 at the bulkhead 30 appropriate. Right of the bulkhead 30 is the passenger compartment with the footwell of the driver. The splashboard 30 is shown only schematically and can be performed in known ways.

Below the brake booster 10 is an actuator 20 at the bulkhead 30 appropriate. This is essentially formed by an angle arm, which has a pivot axis 21 swiveling on the bulkhead 30 is appropriate. The pivot axis 21 of the actuator 20 runs in the Y direction. The actuator 20 is so below the brake booster 10 attached that its free end towards the bottom of the brake booster 10 has. In normal operation of the motor vehicle has this tip of the actuator 20 Contact with the bottom of the brake booster 10 or is located at a small distance to the bottom of the brake booster 10 , The actuator 20 stands by the bulkhead 30 from and is in this position by holding brackets, not shown, or a corresponding clamping force in the pivot axis 21 held.

1 shows the actuator 20 at the moment when the gearbox is out of normal position due to a frontal impact 40 in a position 40 ' pushed and the actuator 20 contacted on its convex side. This causes the actuator to pivot 20 around its pivot axis 21 up, contacted the bottom of the brake booster 10 and pushes it up in the direction of the arrow. The brake booster moves 10 along the bulkhead 30 ,

The power of the gearbox 40 ' in the X direction was so through the actuator 20 advantageous in a force on the brake booster 10 implemented in Z-direction. In this way, the load path between transmission housing 40 ' and brake booster 10 lifted in the X direction. The gearbox 40 ' can get under the brake booster 10 push or the brake booster 10 Can with its bottom at the top of the gearbox 40 ' slide. Such an actuator 20 However, it does not necessarily have to be present, but the brake booster 10 can also be moved by other components of the vehicle in the Z direction in a frontal collision. For example, a direct contact between the gearbox 40 and the underside of the brake booster 10 occur.

So that the brake booster 10 controlled at the bulkhead 30 can slide along, is the fastening device 50 executed at least in two parts. 2 shows the two fasteners 51 and 52 the fastening device 50 , The first attachment part 51 is at the brake booster shown in dashed lines 10 appropriate. This is realized by a plurality of attachment points, for example in the form of screw, of which two screw 61 and 62 are shown. Because this first attachment part 51 together with the brake booster 10 can move, it is also referred to below as a movable attachment part. A second fastening part 52 is attached to the bulkhead, not shown. This is also done via multiple attachment points, two of which attachment points 63 and 64 are shown. This second attachment part 52 is also referred to below as a fixed fastening part.

The fastening parts 51 . 52 are formed by profiled plates that lie parallel to each other. Here are the fasteners 51 . 52 connected to each other via at least one connecting element. In the embodiment of the 2 is a connecting element 60 shown in the form of a bolt or shear pin. This bolt 60 is guided by holes in the first and second fastening part, which are aligned with each other. Both fasteners 51 . 52 also each have a recess 53 or. 54 on, who are also aligned. Through these recesses 53 . 54 is the push rod of a brake pedal to the brake booster 10 guided (not shown).

Furthermore, the fixed fastening element 52 executed in its lower region L-shaped, so that one of the fastening part 52 protruding area forms, as a support element 55 serves. On this support element 55 is the lower end of the movable fastener 51 on, so that the weight of the brake booster 10 on the support element 55 supported.

3 shows a schematic section A - A through a fastening device 50 according to 2 , From this section it can be seen that the fixed fastening part 52 in a guide within the movable attachment part 51 is appropriate. These are in the movable attachment part 51 two sliding grooves 70 and 70 ' educated. The fixed attachment part 52 has corresponding sliding elements 71 and 71 ' on that within these sliding grooves 70 . 70 ' are guided. In this way, the two fasteners 51 . 52 in the Z direction against each other. 3 further shows the aligned recesses 53 . 54 for the push rod of the brake pedal and other attachment points 61 ' and 63 ' , 4 shows a schematic section BB through a fastening device 50 according to 2 , The cut passes through two connecting elements 60 . 60 ' ,

Will the brake booster 10 pushed in the Z direction upwards, occur in the connecting elements 60 . 60 ' Shearing stresses on. The material and the dimensions of the connecting elements are chosen so that they deform from a certain shear stress and a movement of the movable fastening part 51 with respect to the fixed attachment part 52 release. This break the shear pins, like the 5 it can be seen that a broken connecting element 60 shows. The movable attachment part 51 can be so with the brake booster 10 Move up in the direction of the arrow. At the same time the two recesses shift 53 and 54 to each other, but the size of the recesses is chosen so that the push rod 80 (shown schematically by dashed lines) still free by the fastening device 50 to the brake booster 10 is guided.

6 shows a front view of a fixed attachment part 52 , ie the fastening part on the bulkhead. From this view are two upper attachment points 63 . 63 ' and two lower attachment points 64 . 64 ' seen. Furthermore, the two connecting elements 60 and 60 ' and the shape of the recess 54 to see. This recess 54 is designed as a slot whose longitudinal alignment is in the Z direction.

6 also shows the two sliding elements 71 and 71 ' pointing in the Z direction on opposite sides of the fastening part 52 run. The sliding elements run 71 . 71 ' not parallel, but the distance between the two sliding elements increases upward in the Z direction. The distance B between the two sliding elements 71 . 71 ' is at the upper end of the attachment part 52 greater than the distance b at the lower end. The two sliding elements 71 . 71 ' are so V-shaped to each other. The same therefore also applies to the associated Gleitnuten in the movable attachment part.

The sliding elements 71 . 71 ' can be carried out continuously in the Z direction. But you can also as in the embodiment of 7 be executed interrupted or shortened, so that a sliding element does not extend completely over the height of a fastening part. The front view of the 8th shows a second embodiment of a movable fastening part, ie the fastening part 51 at the brake booster. Analogous to the broken sliding elements 71 and 71 ' on the fixed mounting part 52 are interrupted on this component broken Gleitnuten 70 and 70 ' intended. By interrupting the Gleitnuten and the sliding elements they can be easily solved by a movement of the brake booster in the Z direction after a few millimeters of movement.

9 a schematic section CC by a fastening device, which is a fixed fastening part 52 according to 7 and a movable attachment part 51 according to 8th having. However, the two fasteners are shown at a distance from each other.

LIST OF REFERENCE NUMBERS

10

Brake booster

20

actuator

21

swivel axis

30

Vehicle component, bulkhead

40

Position of the gearbox housing in normal position

40 '

Position of the gearbox housing at initial contact

50

fastening device

51

First fastening part,

52

Second fastening part

53.54

recess

55

support element

60.60 '

connecting element

61.61 '62.62'

Attachment point on the brake booster, screw connection

63.63 '64.64'

Attachment point to vehicle component, screw connection

70.70 '

slide groove

71.71 '

Slide

80

pushrod

Claims (6)

A brake booster device comprising a brake booster (10) mounted to a vehicle component (30) via a fastener (50), the fastener (50) having at least two fasteners (51; 52), a first fastener (51) fixed to the brake booster (10) is connected, while a second fastening part (52) is fixedly connected to the vehicle component (30), and wherein the two fastening parts (51, 52) via at least one connecting element (60, 60 ') are interconnected the two fastening parts (51; 52) each have a recess (53; 54) which are aligned with one another, wherein the push rod (80) of a brake pedal is guided through the recesses (53; 54), characterized by a Actuator (20), by which the brake booster (10) along the vehicle component (30) is displaceable, wherein the actuator (20) in a frontal impact by force of a transmission housing (40) is activated, and wherein the actuator (20) pivotally below the Brake booster (10) is mounted and when pivoting a force in the Z direction up on the brake booster (10) applies, so that the brake booster (10) along the vehicle component (30) moves, wherein the connecting element (60; 60 ') during the movement of the brake booster (10) along the vehicle component (30) is deformed by shear stress load, and wherein the two fastening parts (51; 52) in the direction along the vehicle component (30) in a guide slidably into each other. Bremskraftverstärkereinrichtung after Claim 1 , characterized in that a connecting element (60, 60 ') is formed by a bolt, which is guided by mutually aligned bores in the first fastening part (51) and the second fastening part (52). Bremskraftverstärkereinrichtung after Claim 1 or 2 , Characterized in that a fastening part at least two in the Z direction is along the vehicle component (30) extending sliding grooves (70; 70 '), in which respective sliding elements (71; 71') of the other fastening part are received. Bremskraftverstärkereinrichtung after Claim 3 , characterized in that the distance (B; b) between the slide grooves (70; 70 ') increases in the Z direction, ie along the vehicle component (30). Brake force amplifier device according to one of the preceding claims, characterized in that the second fastening part (52) has a support element (55) which projects in the direction of the brake booster (10) from this second fastening part (52), wherein the first fastening part (51) on the Supporting element (55) rests. Brake force amplifier device according to one of the preceding claims, characterized in that the recesses (53; 54) are formed by elongated holes whose longitudinal alignment in the Z-direction, ie along the vehicle component (30).

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